linux-kernel - Re: [PATCH v5 1/2] bus: mhi: host: Add spinlock to protect WP access when queueing TREs

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Date: Fri, 15 Dec 2023 11:23:42 -0700
From: Jeffrey Hugo <quic_jhugo@...cinc.com>
To: Qiang Yu <quic_qianyu@...cinc.com>, <mani@...nel.org>
CC: <mhi@...ts.linux.dev>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_cang@...cinc.com>,
        <quic_mrana@...cinc.com>, Bhaumik Bhatt <bbhatt@...eaurora.org>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] bus: mhi: host: Add spinlock to protect WP access
 when queueing TREs

On 12/10/2023 11:42 PM, Qiang Yu wrote:
> From: Bhaumik Bhatt <bbhatt@...eaurora.org>
> 
> Protect WP accesses such that multiple threads queueing buffers for
> incoming data do not race.
> 
> Meanwhile, if CONFIG_TRACE_IRQFLAGS is enabled, irq will be enabled once
> __local_bh_enable_ip is called as part of write_unlock_bh. Hence, let's
> take irqsave lock after TRE is generated to avoid running write_unlock_bh
> when irqsave lock is held.
> 
> Cc: <stable@...r.kernel.org>
> Fixes: 189ff97cca53 ("bus: mhi: core: Add support for data transfer")
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>

Seems to work fine for AIC100

Reviewed-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
Tested-by: Jeffrey Hugo <quic_jhugo@...cinc.com>